668887678 has 16 divisors (see below), whose sum is σ = 1063044864. Its totient is φ = 314565120.

The previous prime is 668887673. The next prime is 668887721. The reversal of 668887678 is 876788866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668887673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54883 + ... + 65953.

It is an arithmetic number, because the mean of its divisors is an integer number (66440304).

Almost surely, 2^668887678 is an apocalyptic number.

668887678 is a deficient number, since it is larger than the sum of its proper divisors (394157186).

668887678 is a wasteful number, since it uses less digits than its factorization.

668887678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12867.

The product of its digits is 43352064, while the sum is 64.

The square root of 668887678 is about 25862.8629119052. The cubic root of 668887678 is about 874.5495054628.

The spelling of 668887678 in words is "six hundred sixty-eight million, eight hundred eighty-seven thousand, six hundred seventy-eight".